66986369 has 4 divisors (see below), whose sum is σ = 67008960. Its totient is φ = 66963780.

The previous prime is 66986351. The next prime is 66986371. The reversal of 66986369 is 96368966.

It is a happy number.

66986369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96368966 = 2 ⋅48184483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66986369 is a prime.

It is a super-2 number, since 2×66986369² = 8974347263608322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66986369.

It is not an unprimeable number, because it can be changed into a prime (66986669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6029 + ... + 13050.

It is an arithmetic number, because the mean of its divisors is an integer number (16752240).

Almost surely, 2^66986369 is an apocalyptic number.

It is an amenable number.

66986369 is a deficient number, since it is larger than the sum of its proper divisors (22591).

66986369 is a wasteful number, since it uses less digits than its factorization.

66986369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22590.

The product of its digits is 2519424, while the sum is 53.

The square root of 66986369 is about 8184.5200836701. The cubic root of 66986369 is about 406.1272644142.

The spelling of 66986369 in words is "sixty-six million, nine hundred eighty-six thousand, three hundred sixty-nine".